Experienced mac/iphone/haskell/gnu developer. Maintaining and clean GL and AL wrappers, and cleaner ObjC integration which allows to develop Cocoa apps. (can provide and also port to iPhone), and defunct Xcode haskell plugin considered to be rewritten.

Haskell-to-iPhone compiler, tricky iPhone stuff, GHCi

Games, roguelike, scrolling shooter - Realtime game and procedural development visualization engines and environment, animation and music apps

There are at least two ways to use Haskell to make iPhone apps.
One is having a Haskell-to-iPhone compiler, which would probably cross-compile from another host environment (probably Mac OS X).
Another way is to write Haskell programs that generate iPhone-compatible code when run (rather than when compiled), based on an embedded DSL, similarly to Compiling Embedded Languages.